Drill



May 31, 1938. w PEARCE I 2,119,349

DR ILL Filed Dec. 223, 1936 Patented May 31, 1938 UNITED STATES PATENT-OFFICE 3 Claims.

This invention relates to a drill.

An object of the invention is to provide a drill of that type speciallydesigned for use in deep well drilling.

Another object of the invention is to provide a drill having a hollowhead containing a relatively large chamber for the drilling fluid andhaving a cutting blade with novel outlets leading from the chamber ontothe blade in front of the blade cutters.

It is another object of the invention to provide in a drill a novel typeof blade formed with forwardly extended side reamers one at each outermargin of the blade.

It is a further object of the invention to provide a drill having ablade member whose upper end is shaped to register with the lower end ofthe body and to be welded thereto, the upper end of the blade memberhaving outlet openings for the drilling fluid and being surfaced with avery hard material which hard material forms also a lining for theoutlets to the end that the portion of the drill subjected to thegreatest amount of erosion of the gritty drilling fluid will be enabledto withstand the erosive effect of the fluid flowing under highpressure.

With the above and other objects in view the invention has particularrelation to certain novel features of construction, arrangement of partsand use, an example of which is given in this specification andillustrated in the accompanying drawing wherein:--

Figure 1 shows a side view of the drill, partly in section.

Figure 2 shows an edge view thereof, partly in section.

Figure 3 shows a lower end view, and

Figure 4 shows a plan view of the blade portion detached.

Referring now more particularly to the drawing wherein like numerals ofreference designate the same parts in each of the figures, the numeral ldesignates the cylindrical drill head whose upper end is formed with athreaded shank to receive the drill collar. The numeral 3 designates thebody of the drill which is widened beyond the head and is approximatelyelliptical in horizontal cross section. The body is shell like havingcomparatively thin walls and containing a large chamber 4. The numeral 5designates the blade member. The upper end of this member is shaped toconform to the contour of and to register with, the lower end of thebody 3 and is preferably welded thereto by the weld 6. The chamber 4continues on down into the blade member B'as indicated in Figure 2, theupper end of the blade member being hollowed out or concaved for thatpurpose. The lower end of the blade member is divided and formed withthe oppositely directed cutters 1, 1. Above the for- 5 ward sides of therespective cutters are the outlet openings 8, 8 through which thedrilling fluid entering the chamber 4 may be discharged onto the facesof the blade member above the respective cutters. These outlets 8 areelongated trans- 10 versely so as to discharge the drilling fluid incomparatively thin sheets whereby the fluid will spread over the forwardfaces of the cutters.

As above indicated the drilling fluid is gritty and is forced down intothe well under high pres- 15 sure. It will strike against the bottom 9of the chamber 4 and will spread and pass out through the openings 8. Inorder order to render these parts, which are subjected to the greatesterosion, durable, the bottom of the chamber 4 is 20 lined with stellitewhich as is well known to those familiar with the art is a very harddurable material and thissurfacing material is extended each way andcontinued through the openings 8 forming a lining therefor to the endthat the bottom of the chamber will not be readily cut away or theopenings enlarged. The outer margins of the blade member have theforwardly extended vertical side reamers I0, Ill which taper downwardlyand terminate at the lower ends of the cutters I. These side reamersream out the bore as drilling progresses and maintain the gauge thereofand also prevent the drilling fluid emerging through the openings 8 fromstriking against the side walls of the bore and causing 35 the same tocave.

When the blade section 5 becomes worn away the drill may be withdrawnand the blade section removed with a cutting torch and a new one weldedto the body 3 and the drill thus effectively 4o renewed.

The drawing and description disclose what is now considered to be apreferred form of the invention by way of illustration only while thebroad principle of the invention will be defined 45 by the appendedclaims.

What I claim is:-

l. A drill comprising a head having an upward threaded extension for theconnection of a driving member thereto and having a depend- 50 inghollow body, a blade portion on the lower end of the body, said body andblade portion having an inside chamber which has transversely elongatedoutlets on opposite sides of the blade portion, the outlets and thebottom of the cham- 55 her between the outlets being lined with hardsurfacing material.

2. A drill comprising a head having an upward threaded extension for theconnection of a driving member thereto, and having a depending hollowbody formed of relatively thin walls, a blade portion on the lower endof the body, said body and blade portion having an inside transverselyelongated chamber which has transversely elongated outlets on oppositesides of the blade portion, a hard surfacing material welded to andlining the bottom of said chamber from one outlet to the other and alsolining the walls of the outlets.

3. A drill comprising a head having a threaded said outlets.

shank for the connection of a driving member thereto and having adepending hollow body, a separate blade portion welded to the lower endof the body, said body and blade portion having an inside, transverselyelongated, chamber which has outlets on opposite sides of the bladeportion, the upper end of the blade portion which forms the bottom 01the chamber having hard surfacing material formed integrally therewithand forming a lining for the bottom of said chamber which extends acrosssaid bottom entirely from one outlet to the other outlet and which isextended into and forms linings for the walls of WILLIAM L. PEARCE.

